ATMEGA324P-15AZ Atmel, ATMEGA324P-15AZ Datasheet - Page 284
ATMEGA324P-15AZ
Manufacturer Part Number
ATMEGA324P-15AZ
Description
MCU AVR 32K FLASH 15MHZ 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA324P-15AZ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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24.7
284
Addressing the Flash During Self-Programming
ATmega164P/324P/644P
The Z-pointer is used to address the SPM commands. The Z pointer consists of the Z-registers
ZL and ZH in the register file.
Since the Flash is organized in pages (see
be treated as having two different sections. One section, consisting of the least significant bits, is
addressing the words within a page, while the most significant bits are addressing the pages.
This is shown in
addressed independently. Therefore it is of major importance that the Boot Loader software
addresses the same page in both the Page Erase and Page Write operation. Once a program-
ming operation is initiated, the address is latched and the Z-pointer can be used for other
operations.
The LPM instruction use the Z-pointer to store the address. Since this instruction addresses the
Flash byte-by-byte, also bit Z0 of the Z-pointer is used.
Figure 24-3. Addressing the Flash During SPM
Note:
Bit
ZH (R31)
ZL (R30)
Z - REGISTER
1. The different variables used in
PROGRAM MEMORY
BIT
Z15
Z7
23
15
PAGE
PROGRAM
COUNTER
7
15
Figure
PAGE ADDRESS
WITHIN THE FLASH
ZPCMSB
PCMSB
Z14
22
14
Z6
24-3. Note that the Page Erase and Page Write operations are
6
PCPAGE
Z13
Z5
21
13
5
Figure 24-3
ZPAGEMSB
PAGEMSB
Table 25-7 on page
PCWORD
Z12
20
12
Z4
4
WORD ADDRESS
WITHIN A PAGE
(1)
are listed in
1
0
0
INSTRUCTION WORD
Z11
Z3
19
11
3
PAGE
Table 24-9 on page
299), the Program Counter can
Z10
18
10
Z2
2
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
Z9
Z1
17
291.
9
1
7674F–AVR–09/09
16
Z8
Z0
8
0
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